George Lee “Sparky” Anderson is ranked fourth all-time for career managerial wins in Major League Baseball (behind Connie Mack, John McGraw and Tony La Russa) and is the first manager to win the World Series while leading clubs in both leagues. He piloted the National League’s Cincinnati Reds to the 1975 and 1976 championships, then added a third title in 1984 with the Detroit Tigers of the American League. It is interesting to note that either manager in the 1984 Series would have been the first to win in both leagues, since San Diego Padres (NL) manager Dick Williams had previously won the series with the Oakland Athletics (AL) in 1972 and 1973.
His record ended with the 2006 World Series, when St. Louis Cardinals manager Tony La Russa (who had previously won the World Series with the Oakland Athletics in 1989, and who considers Anderson his mentor) led his team to the title over the Detroit Tigers.
Source - http://en.wikipedia.org/wiki/Sparky_Anderson